On 1 March 2014, thousands of mud-covered people celebrated the 28th annual Bloco da Lama festival in the town of Paraty in Brazil.
"Bloco da lama" means "mud block". Although this carnival coincides with the more sequinny Rio de Janeiro festival, the only costume you'll find here is black, sticky mud from Paraty's shallow lagoon.
Although some people mix things up by wearing vines, bones and rags, which gives the event a pagan feel.
There is live music, sound systems and parades. Popular activities include splashing around in the lagoon, and ganging up to ambush non-muddy people with hugs.
Soon everyone is filthy.
The tradition of mud-smearing is said to date back to ancient times, when the locals would cover themselves in clay for medical purposes.
However, Bloco da Lama itself only began in 1986, when two local teens went crab hunting then turned up in the city covered in black mud.
